<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    function Content(){
      return <p>我是内容</p>
    }

    class Title extends React.Component{
      //类式组件必须拥有一个render方法,当组件被使用的时候 组件实例会找render方法拿返回的虚拟DOM
      render(){
        return <h1>标题</h1>
      }
    }


    class App extends React.Component{
        render(){
          return (
            <div>
              <Title/>
              <hr/>  
              <Content/>  
            </div>
          )
        }
    }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<App/>)


  </script>
</body>

</html>